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Latest News
NRC nominee Nieh commits to independent safety mission
During a Senate Environment and Public Works Committee hearing today, Ho Nieh, President Donald Trump’s nominee to serve as a commissioner at the Nuclear Regulatory Commission, was urged to maintain the agency’s independence regardless of political pressure from the Trump administration.
B. K. Shukla
Fusion Science and Technology | Volume 65 | Number 1 | January 2014 | Pages 145-153
Lecture | doi.org/10.13182/FST13-647
Articles are hosted by Taylor and Francis Online.
The 82.6 GHz/200 kW and 42 GHz/500 kW electron cyclotron resonance heating (ECRH) systems will be used in Tokamak SST-1 to carry out preionization and start-up experiments at 3.0- and 1.5-T operation. The 82.6-GHz gyrotron system has been tested for continuous waves (1000-s duration) using a conventional high-voltage power supply and for pulsed operation (200 kW for 1 s) using a regulated high-voltage power supply. The 42-GHz ECRH system is a pulsed system (500 ms), which will be used to carry out preionization and start-up experiments at 1.5 T (fundamental harmonic) on SST-1 and at 0.75 T (second harmonic) on Tokamak Aditya. The circular corrugated waveguide-based transmission line system contains two waveguide switches: one to test the gyrotron on a dummy load or the tokamak and the second switch to launch the ECRH power, either in SST-1 or in Aditya. The 42-GHz system has been tested on a dummy load, and the gyrotron delivers 500-kW power at beam voltage ∼49 kV and beam current ∼18 A. The output of the gyrotron is Gaussian (TEM00 mode) with mode purity >99%. The system is commissioned on both tokamaks (SST-1 and Aditya) to launch power in any tokamak.
